(Solved): Water flows downward along a pipe that is inclined at 40 degrees below the horizontal, as shown. A ...

Water flows downward along a pipe that is inclined at 40 degrees below the horizontal, as shown. A manometer is used to measure the pressure difference due to gravity and partly due to friction. Determine the pressure difference $p_a-p_b$ if the length $L$ is $5\mathrm{ft}$ and the height difference in the manometer, $h$, is $6\mathrm{in}$. The density of the water is $\rho =1.94\mathrm{slug}/{\mathrm{ft}}^3$ and the specific gravity of the mercury is 13.55 . The acceleration of gravity is $32.2\mathrm{ft}/{\mathrm{s}}^2$ and your answer for the pressure difference should be in psi.